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Shark, queen of water world has survived even the dinosaurs. The earliest evidence of sharks are isolated bones, teeth and scales of about 430 million years, a period known as the "Age of Fishes." Many believe that shark is fierce in nature, bonwit teller but the fact is that only a few of the 370 species of sharks are considered dangerous, namely: the great white shark, tiger shark, bull shark and oceanic white tip shark.
They can survive in all climates, from cold to temperate waters. They can also survive in waters with temperatures around 90 degrees Fahrenheit. Almost all sharks are carnivores and eat seals, dolphins, sharks and other fish. They are cold-blooded animals, which means that their body temperature is changed, when the water temperature is changed. Sharks have a smooth, aerodynamic body structure that supports them to swim without using much energy. This is very important because they do not sleep and most of them continue their journey without rest.
As every creature has the ability to defend itself against enemies, and sharks have skin like the spiky armor. Shark teeth change over a period of time to keep sharp. Within one year old shark goes from 7 to 12 sets of teeth. To meet their needs, the different species of sharks are different types of teeth. Sharks do not take advantage of their teeth to chew. They drown their prey and swallow them whole or in large pieces. The most common form of shark teeth is triangular.
Sharks have six senses that make them very well prepared for their prey. Six senses that shark is a very efficient search and hunt prey are vision, vibration, hearing, smell, taste and electro-perception. The shark can sense vibrations in the water and this causes it to go straight to the source of the vibrations. Shark has very sensitive nostrils that can find its prey, even of small size with great accuracy. They rest during the day and night they go hunting. According to a study, they eat about 1% to 10% of their total body weight per week.
The process of mating bonwit teller of sharks varies according to their size. For the smaller species, the male curls around the female. In the larger species the male ranks alongside the female. Males of many species during mating bite females on the pectoral fins or the middle of the back to keep them. Female bonwit teller sharks often have wounds and scratches after mating. In some blue sharks, females are twice as thick skin on the back and waist compared to those of males.
Fertilization of the shark and release of eggs takes place within her body. Male sharks have modified inner edges of the pelvic fins. While mating, straight claspers and put them in the female. Muscles cause separation of semen in her preminavyaneto claspers its establishment in the female oviduct.
Depending on its type, sharks have from 1 to 100 small. bonwit teller Some sharks lay eggs, while others have puppies. Some sharks do not worry about their young after birth, although sought safe places where they can lay eggs or give birth. Many small swim close to shore. They need 10 to 15 years to grow fully and have an average life span of 100 years.
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